Burner structure



00 23, 1945. B. PRATT 2,387,680

BURNER STRUCTURE Original Filed Dec. 29, 1938 2 Sheets-Sheet l In vflni'ort 5,861 Pr aZZ',

Patented Oct. 23,, 1945 BURNER STRUCTURE Best Pratt, Chicago, Ill., assignor to Brake Equipment & Supply Company, Chicago, Ill., a corporation of Illinois Original application December 29, 1938, Serial N 0. 248,337. Divided and this application March 27, 1941, Serial No. 385,573

3 Claims.

The present invention relates to a burner structure for gas ranges, the application being a. di-

vision of my application for Gas range structures,-

Serial No. 248,337, filed December 29, 1938, issued November 3, 1942 as Patent No. 2,300,961.

The principal objects of the invention are to provide a novel form of burner producing a very efficient flame and which can be very economically manufactured.

Other objects and advantages of the invention will be apparent from the following specification and drawings, wherein:

Figure 1 is a plan view of a gas range burner box fitted with devices of the present invention.

Figure 2 is a side elevation of the structure shown in Figure 1.

Figure 3 is a vertical sectional view on the line 33 of Figure 2.

Figure. 4 is a plan view of a front and rear burner assembly.

Figure 5 is a vertical sectional view, its upper portion being taken on the line 5-5 of Figure 4 and its lower portion being taken on line Fur-5a of Figure 4.

Figure 6 is a vertical sectional view on the line G6 of Figure 4, and

Figure 7 is a vertical sectional view on the line 1-1 of Figure 4.

The structure for use in a gas range burner box illustrated in Figures 1 and 2 includes front burners 8 and 9 and rear burners l0 and l l. The front burner 8 consists oi a single main burner head l2 which receives a. mixture of gas and primary air through a single mixing tube l3. The front burner 9 is a double burner and comprises a main burner head I2 and a simmer burner head I4, each of which burner heads is adapted to receive gas and air through a separate passage in a double mixing tube IS. The two rear burners Ill and H are both. double burners, burner l0 consisting of a main burner head I: and a simmer burner head [4, each of which separately receives gas and air through a double mixing tube It. Rear burner l I comprises a main burner head In and a simmer burner l4, main burner I2a being of a form slightly different from the main burnerhead l2.

The burners of the present invention receive gas and primary air through the mixing tubes referred to above, and which are disclosed in detail in my divisional application entitled Mixing tube structure, Serial No. 385,572, filed of even date herewith. The mixing tubes receive gas from the valve structures generally designated by the numeral I40 and which are fully disclosed in the above-mentioned original application,

The three main burner heads It used in the front burners and one rear burner of the Figure 1 assembly are of the construction illustrated in vertical section in Figure 5. As shown in the latter figure, each head l2 includes a base plate [8 and a burner body IS. The base plate I8 is in the form of a flat ring including a downwardly thickened portion or boss adapted to bear upon the upper surface of a mixing tube as hereinafter described. The burner body I9 'is annular and of generally inverted U-shaped form in radial section with the outside surfaces of its lower edges of such diameter that it will overlie and fit upon the upper surface of the base plate l8. The outer circumferential wall 22 of the burner body I9 is inclined slightly inwardly from its lower edge and is inwardly offset nearer its uppenportion to provide a rounded shoulder 23. Jet ports 24 are circumferentially spaced about the outer wall 22 in a single line and immediately above the offset and rounded shoulder 23. Each of these ports extends through the wall 22 at an angle of about 10 above the horizontal, with the outer or jet end uppermost.

The inner wall 25 of burner body 19 is substantially straight to a point approximately midway of its height and merges into an outwardly curving portion 26 which forms the upper portion of the 'burner body and'joins the rounded upper portion of the outer wall 22. By the above arrangement, any substance which may drop upon the upper portion of the, burner during cooking will usually be directed down the inner and. blank wall 25 thereof so as not to clog the burner jet ports 24. Because of the steepness of the outer wall 22, any substance which might move down the same will move directly past the jet ports 24. The slight upward inclination of the jet ports 24 will cause the ring of flame formed bythe same to be of proper diameter and to extend upwardly about the periphery of the burner.

As best shown in Figure 1, outwardly extending securing lugs 28 are circumferentially spaced about the lower edge of the outer wall 22 of each burner body IS, the lugs 28 being arranged to be aligned with lugs 29 which project outwardly from the burner base plate 18 as indicated in Figure 2. The lugs 29 on the burner plate are threaded to receive a machine screw 30 in a manner similar to that illustrated in Figure 6.

As shown in Figure 5, each burner base l8 has an opening 35 extending througiiits thickened portion or boss 20 and through which gas may 9 of Figure 4.

flow into the burner. Thisopening, illustrated:

in plan by dotted lines in Figure 2, is of such outline as to be a -portionor segment of an annulus.

If theburner isintended to be lightedby apilot .light or from a simmer burner, a radial slot 38 (Figure is provided'in the baseplate 20,

preferably substantially diametrically oppositethe gas supply aperture 35, and the outer wall 22 of the burner'body I9 associateditherewithis similarly slotted as at 39. By this arrangement, when gas issues from the burner jet ports '24 of the burner body, it will also issue from the aligned slots 36 and 39 which, in effect, form a single long slot 4|.

from such slot will result in a flame which will:

, burner head I2, including a. burner base plate I8 and a burner body I9, such as shown indetail in Figures 5 and 6 in connection with the burner The burner 9 also includes a centrol simmer burner head l4. I2 and simmer burner head I4 are fitted upon a double mixing tube I5 of the type disclosed in detailin my other above-identified divisional application, and comprising a main burner mixing tube or passage 13a and a passage I5 leading to the seat for the simmer burner I4 as best shown in Figures 5 and 6. Throughout the greater portion of its length, the passage I5 extends parallel with the passage I3a leading to the main burner,

. but just forwardly of the .outlet chamber' '54a of the passage 13a, the passage I5 is directed outwardly at right angles and opens through a port I6 to an open ended chamber 11 having an inwardly projecting annular flange I8 at its lower end. The inner edge of flange I8 is threaded to receive the lower and threaded end I9 (Figure 5) of a simmer burner cap 80.

As shown in Figure 5, the simmer burner cap 80 is of sleeve form and includes an'butwardly extending flange 8| at its upper end having ports 82 circumferentially spaced about the same to form upwardly directed simmer flame'jets. The jet apertures 82 are inclined very slightly outwardly from the axis of the cap 80 to spread the ring of flame produced thereby. Gas entering the chamber II will circulate between the wall of the chamber and the sleeve portion of the jet cap 80 and move upwardly through the jet ports It will be noted from Figure 5 that the jet ports 82 of the simmer burner are positioned very slightly below the lower edge of the lower surface of the base plate I8 of the annular main burner I2, and that the outer vertical wall of the chamber 11 is spaced well within the inner wall 25 of the main burner. Thus, the simmer burner I4 will receive an adequate'supply of secondary air, this supply being further assured by the construction of the double mixing tube best shown in Figures 4 and 5, whereby upward movement of air about the simmer burner I4 is only prevented in the area occupied by the right angled portion of the mixing tube I5, and by the tongue 84 which may be provided in casting to connect the chamber H to the forward wall of the outlet chamber 54a of the mixing tube I5. The annular form Ignition of the gas issuing Main burner head of the simmer. burner further assures an ample supply of secondary air through its central passage. n

The fact that thesimmer burner cap is spaced inwardly from the inner wall 25 of the annular mainburner prevents, any substance which might flow down along the wall 25 from dropping upon the jet plate of the simmer burner. It will also be noted from Figure 5- that the simmer burner jet plate is above, or bears on, the mixing tube top wall, so that any substance which might drop from the inner wall 25 of the main burner and onto the upper wall of the mixing passage I5 or the tongue will flow olf these surfaces and will not flow into the simmer burner jet ports.

The manner of securing a rear main burner I2 and a simmer burner I4 to the mixing tube I6 will be apparent from the above description of the front burner 9.

The double burner I I shown in the lower righthand portion of Figure 1 differs from the rear double burner I0 shown in the upper right hand portion of this figure only inthat the main burner body I9a included in burner II is designed to produce a smaller flame than the burner body I9 of burner I2.

As shown in side elevation in Figure 2 and in cross-section in Figure 3, the outer wall 22a of burner body I9a of burner I2a curves or bends inwardly from its lowermost portion and forms 'a shoulder 23a intermediatethe height of the burner. From this point upwardly, the wall 22a is substantially vertical and merges with the inner wall 25a which curves downwardly to a vertical portion 26a. The jets 24a of the burner body are positioned above the shoulder 23a and since this portion of the burner body is of reduced diameter, the flame produced may, with usualgas .fiow adjustment, be somewhat lower in B. t. u. output than the burner body I9 of Figure 5. For example, the burner body of Figure 5 may be operated with an output of 12,000 B. t. u., whereas the burner body l2a of Figure 3 may be used for a 9,000 B. t. u. output. It will be noted that since the burner bodies I9 and I9a are of the same dimensions and shape at their lower edges, both bodies may be applied to similar base plates I8. In other words, theburner body I9a will be provided with ing lugs 28 spaced to fit upon the lugs 29 of a base plate I8. In this way, burner bodies of different capacities may be readily fitted upon similar base plates,

In both forms of burner bodies there is an enlargement in radial section below the burner jet ports, and this enlargement, taken with the curvature, in radial section, of the top portions of the burner bodies, results in a better mixing of air with the gas, and better combustion.

Each of the main burners I2 and I2a is fitted with a slot 4H formed by slots 36 and 39 of the type illustrated in Figure 5 so that these burners may be ignited from a flame produced by their corresponding simmer burners I4. The simmer burners are adapted to be ignited from a pilot burner I20 which receives gas through a suitable laterally extendopen end I25 of the flame-conducting tube is positioned directly in alignment with a small aperture I26 in the outer wall of the simmer burner. By this arrangement when-gas fiows to the simmer burner, a portion of the gas will be directed through the aperture I26 to the adjacent end I25 of the flame-conducting tube I24. The

gas moving through the latter tube will be ignited at the pilot burner I20 and the resulting flame will issue from the outer end of tube I24 to ignite the gas issuing from the simmer burner intended to limit the invention, the scope of the s ametrically opposite the igniting port I26 of a simmer burner.

vIf a burner comprises only a main burner section, as is the case with the burrfer 8 at the lower left-hand portion of Figure 1, the burner body I9 is so positioned upon the gas mixing tube I3 that the igniting slot 39 thereof will be directly opposite the outer end of the adjacent flame-conducting tube I24. Thus, when gas flows to the single main burner comprising the burner 8, some gas will issue from the slot to be ignited by the flame-conducting tube I24 in the manner described above, and the main burner will thereby be ignited.

Figure 4 shows a front and rear assembly of double burners, of the type described in connection with Figures 3, 5 and 6, the front burner being connected to a double air mixing tube l5 and the rear burner being connected to a double mixing tube I6. The two mixing tubes receive gas from a manifold and valve structure I40 provided with two double valves. A pilot burner I20a is positioned centrally of a pilot housing I 23a which includes a flange I whereby it may be bolted to'the top surface of the double mixing tube I6 as shown in Figure 7. A pair of flameconducting tubes I24 projectto the two burners to ignite the same in the manner described above in connection with Figures 1 and 2.

The installation shown in Figure 4, comprising two burners, and one or both of which may be single burners, is particularly adapted for use in a burner box of the type of range which has a burner box at each end thereof and with the oven between the two burner boxes. Obviously an installation such as illustrated in Figure 4,

invention being indicated in the following claims.

I claim:

1. A gas burner of annular'form including a bottom wall and outer and inner walls defining an annular gas chamber, a circular series of jet ports in the outer upper portion of the wall, said bottom wall havin a radial slot extending to its outer edge and opening into the gas chamber, said outer wall having a vertically extending slot in alignment with the slot in the bottom wall and also opening to the gas chamber, the slot in said outer wall terminating below the jet ports so that ignition of gas issuing from the aligned slots will provide aflame to ignite gas issuing from the jet ports.

2. In a gas range burner structure, an outer main burner of annular form to define a central opening, a simmer burner below the central opening defined by said main burner and of a'diameter substantially corresponding to that of the main burner central opening, the simmer burner being provided with vertical jet ports to direct a fiame within the central opening and having a horizontally disposed ignition port therein to direct gas to an ignition tube, the ignition port being below the vertical iet ports so that a, flame created at the ignition port will ignite gas issuing from the vertical ports, the main burner having ports in its outer wall and so disposed that gas issuing therefrom will not be ignited from the ports of the simmer burner, the main burner having a slot in its lower and outer portions spaced circumferentially from the simmer burner ignition port so that gas issuing from the slot will be ignited by a flame at the vertical jet ports of the simmer burner to thereby ignite the ports of the main bumer.

3. In a gas range burner structure, an outer main burner 01 annular form to define a central opening, a simmer burner below the central opening defined by said main burner and of a diameand including the manifold structure I40, can

ter substantially corresponding to that of the main burner central opening, the simmer burner being provided with vertical jet ports to direct a flame within the central opening and having an ignition port therein to direct gas to an ignition tube, the ignition port being below the vertical jet ports so that a flame created at the ignition port will ignite gas issuing from the vertical ports, the main burner having ports in its outer wall and so disposed that gas issuing therefrom will not be ignited from the ports of the simmer burner, the main burner having a slot in its lower and outer portions spaced circumferentially from the simmer burner ignition port so that gas issuing from the slot will be ignited by a flame at the vertical jet ports of the simmer burner to thereby ignite the ports of the main burner.

BEST PRATT. 

